November 2001

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HP Automation Safety: Safety certification or proven in use?

In almost every safety system design class, the question is asked: "Do I need special equipment for safety instrumented systems?" Some available equipment has been certified by organizations like T..

Goble, W., exida LLC

In almost every safety system design class, the question is asked: "Do I need special equipment for safety instrumented systems?" Some available equipment has been certified by organizations like TÜV or FM to meet the requirements of functional safety standards like EN61508. This equipment goes through an extensive inspection and analysis to prove that it meets many requirements created to increase reliability and safety. Many think that this equipment should be the first choice for use in SIS designs. Others, however, prefer to use the same equipment they normally use for process control, stating that it is "proven in use" to be reliable and safe. What is the best choice? What are th

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